Computing machine



Oct, 7, 1941.

H. G. JOHNSTONE ET AL COMPUTING MACHINE 6 Sheets-Sheet l Filed May 13, 1936 "i K) Y i H. G. JoHNsToNE E-r AL 2,258,290

oci. 7, 1941;

COMPUTING MACHIN l Filed May 13, 1936 6 Sheets-Sheet 2r no .Nw ww Oct, 7, 1941. H. G. JoHNsToNE E-rAL v 2,258,290

COMPUTING MACHINE Filed May 13, 1936 e sheets-sheet :s

Oct. 7, 1941; H. G. JoHNsToNE E- r AL 2,258,290

COMPUTING MACHINE Filed'May 13, 1936 6 Sheets-Sheet 4 /A/m/rons Mada/www5 Oct.l 7, 1941.

H. G. JoHNsToNE ET AL COMPUTING MACHINE 6 Sheets-Sheet 5 N .wm

, EN no6@ Q56 `ct. 7, 1941.. H. G. 'JoHNs'roNE' E-r AL 2,258,290

COMPUTING MACHINE Filed May 13, 1956 6 Sheets-Sheet 6^ w vmrons HJw//vsa/vf ovm 9mm,

Patented Oct'. 7, 1941 COMPUTING MACHINE Harold G. Johnstone, Berwyn, and John C. Gates, l Downers Grove, Ill., assgnors to Western Electric Company, Incorporated, New York, N. Y., a

corporation of New York Application May 13, 1936, Serial No. 79,462

5 Claims.

This invention relates to computing machines,

and more particularly to card controlled multiplying machines operable under control of record cards in which digits are represented by a combination of holes.

One object ofthe present invention is the provision of a multiplying machine operable under control of cards on which the digits of computations are in combinational hole form.

' Another object of the invention is the provision in a multiplying machine of means for retaining vone of the factors of a computation in the machine, which factor is common to a series of multiplications.

In accordance with one embodiment of the in- Vention, there is provided a multiplying machine equipped with a pair of sensing heads for engaging a perforated card to take thfactors 'of a problem from each card of a series of cards. In this embodiment of the invention, the sensing 4692 perforated in the multiplier areathereof; and l Figs. 7 and 7-A show, diagrammatically, the

timing of the various parts of the apparatus `shown in the circuit and when placed with Fig. '-A to the right of Fig. 7, will provide a timing chart of the apparatus shown in the circuit.

heads have a plurality of pins which complete electrical circuits through holes in, theY cards, which holes represent the digits of the factors in the so-called combinational form, that is, a digit may be represented by one or a plurality of holes. The circuits, thus completed, translate the combinational hole representations of numbers vpunched in the cards to circuits representing digital values in denominational orders for-controlling the multiplying mechanism. An electromagnetically operated storage device is provided which, under card control, may store a factor taken from a card in the storage device to control the. multiplying apparatus in accordance with other factors taken from individual cards of a series of cards.

A better understanding of the invention will be had by reference to the following detailed description taken in conjunction with the accompanying drawings, wherein Fig. 1 is a fragmentary view of a sensing head which may be used in taking information from cards to control a multiplying mechanism of the type covered by the present invention;

Figs. 2 and 3 are circuit schematics which, lwhen placed with Fig. 2 to the left of Fig. 3, disclose the electrical circuits of the to be described embodiment of the present invention;

Fig. 4 is a viewlshowing a statistical card for controlling a machine of the type covered by the present invention;

Fig.l 5 is a schematic view of the two sensing heads positioned to sense the extreme areas of the card and shows the relative position of the sensing heads and their associated apparatus;

Fig. 6 is a view of a tabulating card perforated to control the sensing heads in the position as shown in Fig. 5'with the number 3479 perforated in the multiplicand area thereof and the number Before referring to the drawings in detail, it Vmay be noted that the multiplying apparatus forming a part of the combination constituting the present invention is substantially the same as the multiplying apparatus disclosed in detail in the co-pending application of HaroldG. Johnvstone Serial No. 436,135, led March 15, 1930.

Furthermore, it should be noted that the card feeding and card sensing mechanisms are substantially the same as that disclosed in the aforementioned Johnstone application with the spe-- .cic exceptions to be enumerated in the detailed description of the present invention. In .the following description, the specic detailsv of the method of recording or registering the results effected by the multiplying mechanism have not been'described in detail since for the purpose of this disclosure the resultsv might be registered on a visual indicating,type of register, or might be recorded in statistical cards in the form of perforations by a mechanism such as that shown in the patent to Harold J. Johnstone No. 2,099,892, issued November 23, 1937, Serial No. 1,840, filed January 15, 1935.` Accumulating registers of the type particularly adaptable for use with the multiplying mechanism shown herein are also shown in PatentsNos. 2,096,429, 1,952,868 and 2,034,260'issued on October 19, 1937, March 27, 1934 and March 17, 1936,.respectlvely, to Harold G. Johnstone.

Referring now to the drawings wherein like,

reference characters indicate similar parts throughout the several views, there is shown in Fig. 1 a portion of a sensing mechanism which vtheir shafts have been numbered |05 and |06,

and the base plate upon which a card would be I fed in passing from the magazine' (not shown) to the card feed rollers is designated |52. The

` stop member for stopping a card under the sensing heads has been designated 20|. In like manner, the sensing head 226, casting 228, guide rods 229, rods 241 and 248, threaded rod 256 and crank 251, threaded rod 258, threaded aperture 259 and crank 26|, aperture 263 and'pointer 265 are assigned reference numerals the same as those used in the* aforementioned Johnstone application.

A pin box 5 replaces the structure shown in the Johnstone application Serial No. 436,135 since in the Johnstone application the cards being sensed were the usual 45 column cards having twelve hole positions in each column any one of nine of which could be perforated to represent aj digit, whereas in the present case the same type of card is used but is divided longitudinally into two parts, an upper half and a lower half, and a combinational holesystem is used so that the digits 1, 3, 5, '1 and 9 are represented in a card by a single perforation, and the digits 2, 4, 6 and 8 are represented in a card by two perforations. The combinational hole system used is clearly shown in Fig. 4, wherein a. record card 6 is shown with apertures in its a card 6 is in position against the stop member and the card has been moved upwardly to engage the pins, the sensing pin |1 will not engage the surface of the card. but will engage a bar 20 of conducting material to the left (Fig. 1) of the card. The pins if they are in alignment with holes in the card as indicated at 2| and 22, willpass through the card and engage the bar 20. If a hole 23 is punched in the card in alignment with the sensing pin I4, the pin |4 will engage a conducting member 24. A pair of card actuated jcontacts 30 are mounted on the -pin box 5 and adapted to be actuated by a plunger 3| provided with a shoulder 32 which normally engages the lower plate I0 being forced into engagement therewith by one of the springs of the pair of contacts 36. However, when a card is in place under the sensing head, theplunger 3| will be moved upwardly (Fig. 1) to close the pair of contacts 36. When there is no card in place under the sensing head, the lower end of the plunger 3| will pass into a hole 33 in the rst nine columns on the lower half of the card Y representingthe numbers 1, 2, 3, 4, 5, 6, '7, 8 and 9from left to right, respectively.

ItI will be understood that in the apparatus shown, each of the factors has been limited to four ldigits to simplify the disclosure and that the card shown in Fig. 4 does not represent a card adapted particularly for use in this machine, but simply shows the code used in cards which may be used in the machine. It also should be understood that the machine is adapted to sense a multiplicand from any four adjoining columns of the card by moving the pin boxes 5 to the proper position, the only limitation being the pin box 5, for the multiplicand may be moved to sense a factor from any four adjoining columns of the card from column 1 to column 41 and that the multiplier pin box 5 may be positioned to sense any four adjoining columns of the card from column 5 to column 45, as shown in Figs. 4 and 6.

The pin box 5, which replaces the pin box shown in the Johnstone application Serial No.

436,135, is secured to the sensing head 226 and carries a plurality of sensing pins of which there are provided in the present embodiment nve pins to a column, and four polumns to a pin box, so that four columns of the card may be have springs I3 surroundingl the upper end of each pin and engaging the upper plate 9 and a shoulder I2 formed on each sensing pin to normally urge the sensing pins downwardly to a position where the lower end of the shoulder |2 will engage the lower plate III. The plates 8 and I0 are secured to the sensing head 226 by imeans of end plates 1 and 8. One of the pin' movable bed 34 in which the bars 20 and conducting member 24 are mounted. This bed is formed of insulating material and is mounted upon the upper end of casting 228.

'I'hepin boxes 5 may be adjusted across the top of the movable bed 34 for columnar selection of perforations in a card by manipulating the cranks 251 and 26|. After the pin boxes have been adjusted to make the desired columnar selection, the movable bed 34 may, in the operationl of the machine, be moved vertically to sense the cards fed onto it by carrying the cards up into engagement with the pins in the pin box 5.

As shown in Fig. 5, the pin box 5 for the multiplicand and multiplier, which have been designated 5 MC and 5 MP, respectively, are adjusted to their extreme outer positions where the pins thereon are in association with the four columns in which perforations may appear at opposite ends of the card. It will be understood that these pin boxes may be adjusted over the card so that the pin box 5 MC maybe moved into ,association with any series vof four bars 20 from the bar designated to the bar-designated 4|,

whereas the pin box 5 MP may be associated with any series of four adjacent bars 20 from the bar designated 5 to the bar 45. Since the pin boxes 5 MC and 5 MP have been shown, in Fig. 5, in their extreme positions, the card shown in Fig. 6 has the multiplicand 3479 and multiplier 4682 shown perforated in rows 1, 2, 3 and 4 and in rows 42, 43, 44 and 45, and a perforation in the area to be sensed by the pin I4 has been shown in the upper row of the card to l illustrate a possible problem which the apparatus boxes 5, for example, the pin box for sensing the y multiplicand, carries a sensing pin |4 similar to the pins and urged downwardly by aspring I5 surrounding the upper end of the pin and inpins |1 of exactly the sam'e construction as thepins and having springs I8 associated therewith for normally urging them downwardly (Fig.

1). These. sensing pins |1 are in direct alignment with each column of ilve pins but when forming the subject matter of this invention is capable of computing. 'I'his example is discussed more in detail hereinafter.

It will thus be apparent that when a card is vadvanced from the hopper (not shown) onto the movable bed 34 and into engagement with the stop member 26| and the movable bed 34 is moved upwardly in the manner described in detail in Johnstone application Serial No. 436,135, the

v the sensing heads, and the pair of contacts 88 will be closed by the plunger 3| due tothe presence of a card under the sensing heads. When the stop member 20| is moved out of the path of the 'card and the movable bed 34 is moved downwardly, the card will be fed out from under the sensing head and to a suitable receptacle (not shown). The method of recording the result, since it does not form a part of this invention, is not being disclosed in detail and this record may be either in the form of a visually indicated registration, or the card may have the result perforated therein by mechanism such as that shown in the Johnstone Patent No. 2,099,892.

It is believed that a better understanding of the invention will be had by describing the circuit in connection with a specificproblem and, for example, it will be assumed that thecards to be sensed have been perforated in the following manner:

The first card has the number 3579 punched therein in the area to be sensed by the multiplicand sensing head, and the number 4682 has been punched therein in the area associated with multiplier sensing head. Further, let it be assumed that the first card in the group of cards bears a punching in the area thereof associated with the sensing pin I4, and that the second card in the series of cards bears the number 1357 in the area thereof associated with the multiplier sensing head. Also let it be assumed that the third card has the number 2468 perforated therein in the area associated with the multiplicand sensing head, the number 2159 in the area thereof associated with the multiplier sensing head, and a perforation therein in the area associated with the sensing pin I4. It will be noted in the assumed problems that there was no multiplicand perforated in the second card. Under such conditions the multiplicand which-was punched in the first card will be assumed to be common to the rst and second cards.

Referring now to. Figs. 2 and 3, the circuit for performing the multiplications outlined hereinbefore for the series of three cards will now be l described in detail. On Fig. 2 there is shown a start key 4D which may be of the usual nonlocking type which, upon operation, will connect ground at 4I momentarily to the winding of a main drive shaft clutch magnet 42 to start the machine in operation. The main drive shaft f clutch being assumed to be a conventional single revolution clutch which willV upon engagement drive the main drive shaft through one revolution.

It will be assumed that a supply of cards has been placed in the magazine (not shown) and that the operation of the main drive shaft clutch magnet 42 will connect the main drive shaft for the machine with a source of power in a manner similar to that disclosedin the Johnstone application Serial No. 436,135, suitable gearing being provided' for operating the feeding of cards and the reciprocation of the movable bed 34 in a predetermined timed relation in the conventional manner, and suitable gearing being provided for supplying power to drive a commutator shaft 43 shown schematically in Fig. 3 provided its associated commutator clutch magnet 44 has been operated. It will be noted at this time that the commutator shaft 43 does not immediately start in operation but waits until the sensing mechanisms have performed their functions and then, as will be described hereinafter. the clutch magof a single revolution clutch 45 in the well known manner. With the assumed series of problems to net 44 will be energized to permit the operation 4'I must preliminarily' be moved to the position shown in full lines (Fig. 2). The first operation of the start key 40 will cause cards to be fed from the magazine (not shown) to position to be engaged by the card feed rollers. However. the magnet 42 must be operated twice in order to feed the first card of the series of cards placed in the magazine (not shown) to the sensing head, as described in the aforementioned Johnstone application.

Upon operation of the start key 40, the clutch magnet 42 will be energized, as will a release relay 48 connected in parallel with the clutch magnet 42', and a locking path will be established by the release relay 48 to a brush 49 associated with a contact disk 50 mounted on the main drive shaft of the machine. 'I'he contact disk 50 has a brush 5I connected to ground at 62 and associated therewith and in engagement with a conducting portion of the disk 50 at all times. The

brush 49 engages the conducting material of the disk 50 in the normal position of the main drive shaft shown vschematically in Fig. 2 and designated 53, and the brush 49 will continue to engage conducting material of the disk until the shaft 53 has moved approximately twenty degrees. The provision of this locking ground from 52 through the brushes 5I and 49 and contact disk 50, insures the positive operation of -the clutch associated with clutch magnet 42, which clutch is as noted hereinbefore of the conventional single revolution type. One revolution of the main drive shaft will cause the advancement of a card from the magazine (notl shown) to engagement with the card feed rollers, and a second operation of the main drive shaft clutch magnet 42, due to the operation of the key 4 0, will advance the card into position under the sensing head and against the stop member 29 I.

It will be understood that the movable bed will move through its cycle as disclosed in the aforecause the sensing pin I4 to engage the conducting member 2'4 to complete a circuit from ground at 6I through the conducting member 24 and sensing pin I4 and winding of a relay 62 to grounded battery at 83, thereby energizing the relay 62. Energization of the relay 82 will connect the grounded battery at 63 through make contact of relay 62 and winding of a slow release relay 64 to ground at 65. The armature of relay 62 has been designated 62--A and the armatures of relay 64 have been designated 64-A and 64-B to clearly illustrate which armatures are operated by the respective relays.

Shortly after the sensing pin I4 engages the conducting member 24, the sensing pins I I which find holes in the card in the area of the card associated therewith and the sensing pins Il, will engage their associated bars 29 to selectively energize multiplicand relays 68 associated with the multiplicand sensing head 69 over a circuit from ground at 65 through the make contact of slow release relay 64 through digit omitting keys I0-U, 'I0-T, I0-H and-'Ill--TH for the units, tens, hundreds, and thousands orders of the multiplicand, respectively, to the bars 20 in the units, tens, hundreds and thousands orders of the multiplicand sensing head 69. The ground at 65 connected to the bars 28 will be continued through each of the holes perforated in the card, to represent digits in the various denominational orders, throughv the make before break contacts of the multiplicand relays 68 and through the windings of the energized multiplicand relays 68 to grounded battery at 63 through the left hand make contact of ,the slow release relay 64.

With the common multiplicand switch 41 in the position shown, ground at 1I will be connected through the switch to the left hand make relays energized through their left hand make contact and winding to grounded battery at 63 over the make contact of the slow release relay 64, or the break contact of relay 62. From the foregoing, it will be apparent that any relay 68 which has been energized will remain energized until the relay 62' is energized after having been energized and deenergized. This function is accomplished through the slow releasing of slow release relay 6,4 which, when energized, will make on its left hand contact to supply the grounded battery at 63 to the multiplicand relays 68, and will hold that grounded battery on the windings of the multiplicand relays for a short time after the release ofrelay 62, whereby relay 62 being an ordinary relay will, upon release connect grounded battery at 63 through its break contact before the path from grounded battery at 63 is broken by the slow release relay 64. In this manner if the common multiplicand switch is in the position shown in full lines (Fig. 2) a multiplicand stored' in the multiplicand relays 68 will remain stored therein until relay 62 operated a second time due to the finding of a hole in a sensed card in the area thereof associated withv the sensing pin I4.

I'here are provided twenty relays 68, five in the units order, iive in the tens order, iive in the hundreds order, and iive in the thousands order. -Each order, however, represents the nine positive digits of a decimal notation, for example, if the relay 68 designated (I and 2) in any order is operated over the circuit through the card, and no other relay 68 in that order is operated, a live circuit representing the digit 1 should be connected to the multiplying machanism and, in like manner, if the relay 68 designated (3 and 4) or (5 and 6). or (1 and 8), or (9) is energized, the digits 3, 5,.'1 or 9, respectively, should be transmitted to the multiplying commutator, and if the multiplicand relay 68 designated (I and 2) Vand the multiplicand relay designated (9) i or the Arelay designated (3, and 4) -and the relay designated 9) or the relay (5 and 6) and the relay (9) ,I or the relay (1 and 8) and the relay (9) are energized, the digits 2, 4, 6 and 8, respectively, are indicated and circuit connections representative of these digits will betransmitted to the multiplying commutator.

The setup of the multiplicand relays will, therefore, condition circuits which will be described contact of the energized relays 68 to hold these accesso ergized to a brush 80 of a stepper switch which constitutes the distributor, indicated generally by the numeral 8I. of the multiplying mechanism. The brush 80 is one of a series of six brushes, the others of which are designated 82, 83, 84, 85 and 86I mounted upon acommon shaft and adapted to be moved upon the release of an electromagnet 81. This stepper switch is of the conventional type which is provided with the usual pawl and ratchet mechanism, and wherein the operation of its associatedelectromagnet 81 will move the pawl against the energy stored in a spring to prepare it `for operation by the spring upon the deenergization of the electromagnet. A switch of this type is shown in detail in Patent No. 2,061,277, issued to H. G. Johnstone on November 17, 1936. The brushes 82 toA 86, inclusive, are non-bridging, that is, they are of such width as to engage only one of their associated contacts at a time and will be disconnected from a contact before they engage a succeeding contact, whereas the brush 80 isof the 'bridging type and will engage a succeeding contact before disengaging from the next previous contact.

The circuit described hereinbefore for connect.- ing ground at 6| through the card actuated contact 30, break contact of release relay 48, to the brush 80, which is in engagement withthe twentysecond contact of its associated group of contacts 88, will be continued through the twentylsecond contact 88 and an armature associated with the electromagnet 81, thro'ugh the winding of the electromagnet to groundedbattery at 90. As soon as the electromagnet 81 is energized over this circuit, it will attract its armature and break the circuit just described, whereby upon the deenergization of the electromagnet 81, the brushes 88, 82, 83, 84, 85and 86 will all step onto their first contacts 88. Y

As soon as the brush188 engages its iirst contact, the circuit through'the brush from ground at 6I through card controlled contacts 38, break,

contact of the release relay 48 will be continued through the brush, the first contact 88 associated with the br'ush 88 to the sensing pin I1 in the units order for the multiplier sensing mechanism and ground will be picked up from the bar 20 in the units order by the brush or brushes II which have found holes in the card in the areas- ,I

more in detail hereinafter, for controlling theA A multiplicand portion of the multiplying mechanism. In the speciiic description of the selected problems, these connections will be described* in detail.

As soon as the selected ones of the multiplicand relays have been energized to eiIect the storage of the multiplicand digits, the further movement upwardly of the movable bed 34 will eiect the closure of the card' actuated contact 30 to connect ground at 6I over .the break contact of release relay 48 which has by this time been deen- 75 associated therewith to selectively energize one or more of a group of multiplier relays 9|.

There are nine multiplier relaysl vrepresenta.- tive of the digits 1 to 9, and these relays control through their contacts the input of the multiplier factor to the multiplying mechanism. The ground supplied bythe brush through its associated contacts 88, through the sensing pins I1 to the bar 20in the units order, will be picked up by the sensing pin or sensing pins II which iind holes in the card inthe area thereof associated with the pins. v

There are, as pointed out hereinbefore, iive sensing pins II, and these sensing pins must translate a combinational hole representation of -a digit into a live circuit representing any one of nine digits. For example, if the left hand pin II is the only one that nds a hole inthe card, ground will be picked up from the bar 28 and passed through that sensing Din Il to energize a relay 92, which is connected to grounded battery at 93 through the winding of a. relay 94. Energization of relay 92 Ywill Vconnect ground at 95 over the break contact of the relay 9Iv (9) for the digit 9. If the rst and second pins II from purposes.

the left nd holes in the card, the relay 92 will be energized over the circuit Just described. and

in addition ground through the secondpin |I from the left (Fig. 2) will be connected through a make contact of relay 92 to multiplier relay 9| (9) and through the winding of the relay 9| (9) and relay 9| (9) and the relay 94 in series to grounded battery at 99, thereby energizing the relays 9| (9). 9| (9) and 94. Energization of relay 9| (9) will open the contacts associated from the left and do not find any other holes..

the relay 92 will not be energized and ground will be connected over a break contact of relayl 92 (not energized) to the winding of multiplier relay .9| (l), thereby to connect ground at 99 over multiplier leads |99. The ground through the multiplier relay 9| (l) `will also go through the multiplier relay 9| (9) and the relay tt in series to grounded battery at 99. 'I'.hiscircuit through the relay 9| (9) serves no purpose at this time. The finding of holes in the card by the sensing pins in the following positions, counting from the left (Fig. 2), the'flrst and third, or third alone, or rst and fourth, or fourth alone, or rst and fifth, or fifth alone,

will, in like manner,l energize the relays 9| (9) or 9| (B) or 9| (4) or 9| (9) or 9| (2) or 9| (9), respectively, and the relay 9| (9) will be operated each time one of the other relays 9| to 9| (9) are operated to put ground on the multiplier leads associated with the various multiplier relays 9| .in a manner similar to that described for the digits 9, 8 and 7.

Each time the relay 94 is energized, it will ,connect ground at I|9 through its make contact and the winding of Vcommutator clutch magnet 44 to grounded battery at III, thereby to cause the commutator shatt. 49 to rotate through one the same as ig; commutator shaft of the Johnstone .applica y n Serial No. 436,135, and will be described only-briefly herein.

The commutator shaft 43 isv utilized in the present invention carries a plurality of contact disks twenty-eight in number, of which one designated ||2 is used for-control purposes, and the-:other twenty-seven are used for multiplying been' designated III. It will be understood that each revolution of the commutator shaft effects the multiplication of all of the digits of the multiplicand by one digit of the multiplier. The ground connections originating at the multiplier relays 9| (I) to 9| (9) being connected lat pre'- determlned times -in the cycle of rotation of the commutator shaft through certain of the contact disks IIS to multiplicand leads I|4. In the first half revolution of the multiplying commutator 43, the units part of the partial product of the selected multiplier digit by all of the multiplicand digits will be sent out over the multiplicand leads, and in the second half of each revolu- The multiplying contact disks have' revolution. .Commutator shaft 49 is substantially tion of the multiplying commutator the tens parts l 1,952,868 of March 27, 1934.

The contact disks |I3 each have four brushes IIB, IIE, I|'| and I |9 associated therewith. The brush H5, which is indicated by an open headed arrow, is always in. contact with a conducting po'rtion of the contact disks, and the brushes H9, |I1 and ||9 areinterconnected with the brush ||5 through the conducting material of the 'contact disks at predetermined intervals. It will be noted thaty there are three contact disks associated with each multiplicand lead ||4 and that the multiplicand leads I I4 are connected to the brushes |I5 of their associated contact disks. It will thus be apparent that whenever one of the brushes H6, ||1 or II8 engages a con ducting portion of its associated contact disk, a circuit path will be prepared from the stationary contact of the associated relay 9| (I) to 9| (9) to a multiplicand lead ||4.

An accumulator designated generally by the numeral |29 is provided for receiving impulses representative of the partial productstransmitted over the distributor 9| from multiplying commutatondt.` This accumulator includes a plurality of electromagnets |2|, one of which is provided for each denominational order from units to ten millions, inclusive. Any conventional carry-over or transfer mechanism may be provided for effecting carries where indicated. Such a carryover mechanism is disclosed in the Johnstone application Serial No. 436,135. It is only necessary .that the accumulator |20 be of the type which will perform accumulations as determined'by the length of time of energization of its electromagnets |2l.

As pointed out herelnbefore, the brushes it, iii and I I9 engageconducting portions of the disks ||3 only momentarily and, therefore, it

has been necessary to provide a locking circuitl to maintain the circuits originally established by the brushes IIB, ||1 and ||8 forholding the electromagnets |2| energized. This locking circuit includes a plurality of holding relays |22 of which there is one provided for each order of the multiplicand. In the present embodiment there being four orders, units, tens, hundreds and thousands in the multiplicand, four holding relays |22 are provided. The holding relaysl |22 are adapted, upon energization, to lock to ground over a brush |23 associated with the control contact disk II2 and connected at predeterminedtimes in the cycle of contact disk ||2 through `the disk and a brush |24 to ground at |25. The

tions, of the contact disks II3 are the same as' those disclosed in the co-pending application Serial No. 436,135 and a further description of the time of making these contacts is, therefore, not believed to be necessary.

Another brush |29 associated with the contact disk ||2 makes contact with the conducting portion of the disk toward the end of each half cycle of-rotation ofthe commutator shaft 49 thereby to connect ground at |25 through brush |24 and the contact disk I I2 to the winding of the stepper magnet 91 to cause the momentary energization thereof, thereby to step the brushes 89, 82, 89, 84, 85 and 98 one place for each half revolution of the commutator shaft 43. This stepping of the brushes in the distributor 8| will distribute the impulses originating at the multiplying cornmutator into the proper denominational orders of the accumulator.

Referring now to the specic problems mentioned hereinbefore, let it be assumed that the ilrst card of the three cards described in the assumed problems has been advanced to position under the sensing heads and against the card stop 29| due to the operation of the start key 40 twice in the manner described herein. 'I'he operation of the movable bed 34 tomove the iirst card carrying the mu1tiplicand3479 and multiplier 4682 up against the sensing pins will cause the sensing pin I4 to engage the conducting member 24 to complete a circuit from ground at 9| through the winding of relay 62A to4 grounded battery at 69, energizing relay 62 and connecting grounded battery at 99 through the make contact of relay 62 and winding of slow release relay 64 to ground at 95. Slow release relay 64 will thus be energized and will connect ground at 65 through its make contact and through the digit omittingvkeys 19-U, 1li-T, 1li-H and 10-TH to the sensing pins |1.

Shortlyafter the relays 62 and 64 are energized, the sensing pins I1 will engage their associated bars 29, and the sensing pins |I in the units, tens, hundreds and thousands orders of the multiplicand sensing head willllnd holes in the card in the following sequence: In the units order the left hand pin II will find a hole; in the tens order the second pin |I from the left will find a hole; in the hundreds order the third pin from the left will ilnd a hole; and in the thousands order, the fourth pin from the left will nd a hole. I'he ground supplied to the bar 20 in the umts order will -be continued through the sensing pin |I, the make before the break contact of relay 99 (9) of the units order, the winding of the relay 99 (9), and make contact of the slow release relay 94 to grounded battery at 69, thereby energizing the' relay l9 9 (9) in the lunits order, and locking it in its energized position over a circuit from ground at 1| through the common multiplicand switch 41, the lelt hand make contact of relay" (9), winding of relay 98 (9), make contact of slow Arelease relay 94 to grounded cand circuit for operation 'in a manner to be described.

scribed circuits to the multiplicand `relays 68 v were completed. 'I'he operation of the card operated contacts 30 connects ground at 6| through the break contact of the release relay 48 to brush 90 in the distributor and through brush 89 standbattery at 99. The sensing pin II in the tens o rder will connect ground from the bar 29 associated therewith, through the make before break contact of. relay 98 (1 and 9), the winding of the relay 99 (1 and 9) and make contact of lays '99 (5 and 9) and 99 (9 and 4) in the same manner as described in connection with the other relays 99 in the units and tens orders, and these will also lock to ground through the common multiplicand switch and to grounded battery through the left hand make contact of the s low release relay 94. The operation oi relays 99 (9) Il (1 and 9), 99 (5 and 9) and B8 (3 and 4) in the-units, tens, hundreds and thousands orders oi' multiplicand relays, will prepare the multipliing on its twenty-second contact, through the armature of electromagnet 81 to grounded battery at 90, thereby momentarily energizing the electromagnet 81 which, upon energization, will break the above described circuit at its armature to step all the brushes 89, 82, 83, 84, 85 and 88 into engagement with their first contacts. As soon as the brushes 80, 82, 93,184, 85, and 88 engage their rst contacts, brush 89 will connect ground at 6| through the card operated contacts 9|), break contact of release relay 48 to the first contact 88 associated with the brush 80, and from the rst contact 88 associated-with the brush 99 to sensing pin I1 in the units order of the multiplier sensing head, thereby placing ground on the' bar 20 in the units order. 1

'I'he umts digit of the multiplier is 2 and, therefore, a hole will be punched in the card 9 in the area-thereof associated with the first and fifth pins I| from-the left. The rlrst oi' these pins, from the left (Fig. 2) in ilnding the bar 29 grounded, will continue that ground connection through the windings of relays 92 and 94 in series to grounded 4battery at 99. The fifth pin from the left (Fig. 2) will continue the ground from bar 28 in the units order through a make contact of the relay 92 and the winding of mul- -tiplier relay 9| (2), and the winding of the multo drive the commutator shaft 49 through one revolution or until relay 94 is deenergized. The operation of relay 9| (9) will break the connection from ground at 95 through contact oi relay 92 to multiplier lead 91. The operation of relay .9| (2) connected ground over its make contacts to a series of'multiplier leads |99 thereby placing groundon the brushes |19 associated with the first, fourth, seventh, tenth, thirteenth, sixteenth, nineteenth, twenty-second, and twenty-fifth contact disks I I9 from the left. When the brushes ||9 just mentioned engage conducting portions of their associated disks H9, thel ground originating at the contacts of the relay 9| (2) will lbe continued momentarily through the brushes H9 associated with those contact disks over the multiplicand leads |I4 to selected ones of the contacts associated with the multiplicand relays 99 in the units, tens,

sands orders oi' the multiplicand. l

Since in the units order only the relay 99 (9) has been energized', and in the tens only the relay 99 (1 and 9), and in the hundreds order only the relay 99 (9 and 9) and in the thousands order only the relay 99 (9 and 4) have been energized, these ground Vpaths over leads I4 will be con-' tlnued in the units order, over the lett hand break contacts of relays 89 (I and 2), 99 (9 and 4), 98 (1 and 9), 99 (l and 9) and the right hand make contact of relay 99 (9) through'the winding of hundreds and thouaccumulator.

|3|. This ground connection will also be conrnected by-a branch circuit through distributor v brush 86 in engagement with its first contact 98 to units electromagnet |2| in the accumulator |20. Energization of the units holding relay |22 will cause the relay to lock up to ground at |25 over brushes |23 and |24 associated with the control contact disk ||2.

Since las pointed out in the copending application Serial No. 436,135, the time of making a contact between the brushes associated with th'e multiplying commutator and conducting portions of the contact disks are representative of the multiplication tables, it will be understood that the time of energization of an accumulator electromagnet is determined by the multiplier magnet 9| which is energized, and the multiplicand relay or relays which are energized in each order.

1n the tens order of the multiplicand, the relay (l and i3) was energized and, therefore, the ground through the contacts of multiplier relay 9i (2) over multiplier leads i3@ and through the brushes associated with the commutator will he completed through the right hand make contact of relay 99 (ll and 8) and the right hand break contact oi relay 69 (S) to the tens holding relay |22, and through brush 8E"to the electromagnet |2i in the tens order of the accumulator 29. Similarly since the multiplicand relay 98 (t and S) was energizedv in the hundreds order, the ground circuit originating at the relay 9| (2) Awill be continued through the commutator and multiplicand leads H4, the right hand make contact of relay 69 (5 and 8) in the hundreds order, break contact of relay 86 (9) to the holding relay |22 for the hundreds order, and through brush @l in engagement with its first contact 08, to the electromagnet |2| in the hundreds order of the The relay 98 (9 and 4) in the thousands order, being the only multiplicand relay in that order which has been energized, will complete a circuit through its right hand make contact and the right hand break contact of relay 68 (B) in that order, to the holding relay |22 in the thousands order, and through brush 99 to the electromagnet |2| in the thousands order of the laccumulator |20. It will be understood that these circuits are prepared by the multiplier and multiplicand relays as soon as these relays are energized and are completed at timed intervals in the rst half revolution of the multiplying commutator, by the engagementfbf the brushes in the multiplying commutator with conducting portions of the associated contact disks.

After the multiplying commutator has comthe tens part of the partial productsof 2X3579. As the multiplying commutator nearsthe endof the second half cycle, the brush |26 again becomes effective to step the distributor brushes into engagement with their third contacts. This will break the circuit holding the relay-9| (2) energized, due to the removal of the ground connection from the sensing pin in the units order. The brush 80, being'a bridging brush, will engage its third contact before it is completely disengaged from its second contact and therefore the relays 92, 94 and 9| (9) will remain energized since the sensing pin in the tens order will immediately become effective to connect ground at Si through the card actuated contacts 30, break contact of release relay 48, brush 80 engaging its third contact, the sensing pin |1 in the tens order, the bar 20 in the tens order associated with the multiplier sensing head, the first and second sensing pins li from the left in the tens order which have found holes in the card t, the relays 92, 94, 9i (t) and 9i (il) in series` to grounded battery at 93. The completion of this cir-cuit will connect ground at 96 through the contacts of the multi-'- plier relay 9| (9) to multiplier leads 99, and the next revolution of the multiplying commutator i3 will transmit the result of the multiplication of the digit 8X3579 into the proper orders of the accumulator itt. Similar circuits Will be com'- pleted to effect the multiplication of the digits 8 and 4in the multiplier by the digits 3579 in the multiplicand and to transmit the partial products of such multiplication to the proper orders of tha accumulator |20.

the end of the -fourth complete revolution of they..

multiplying commutator 43, brush |26 will cause the distributor to step its brushes into engagement with the ninth contacts. In' so doing, brush 90 will engage a contact not connected to any sensing pin and relay 94 will be deenergized mutator shaft due to the release of clutch magnet pleted approximately one-half revolution, at

which time the units part of the partial product of the units digit, or 2, of the multiplier, times -the multiplicand will have been put in to the accumulator, brush |26 will engage :a conducting portion of the control disk ||2 to momfentarily energize the stepper switch 81 over a circuit from ground at |25 through the contact disk and brushes and winding of electromagnet 01 to grounded battery at 90. This will result in the distributor brushes all moving into engagement with their second contacts 89.

Thus, after stepping the distributor brushes into engagement with their second contacts, the second half cycle of the multiplying commutator will, over the same leads which have now been shifted by the stepping of the distributor switch into association with higher orders in the accumulator |20, complete circuits representative of lwhereupon ground at ||0 will be connected through the break contact of relay 94 and brush 82, in engagement with its ninth contact, to operate release relay 48. Deenergization of relay 94 will stop the rotation of the multiplying corn- 44, and ground at ||0 over the break contact of relay 94 will cause the successive making and breaking of the circuit from ground at ||0 through brush 82 to successive contacts 80 associated with brush 82 to energize ,the electro' magnet 8l repeatedly and rapidly to return the brushes into engagement with their twenty-- second contacts.

The. return of the brushes 80, 82, 03, 84, 95, and 86 in the distributor 9| will reset the multiplying machine for the performance of another problem. During this resetting operation the result in the accumulator |20 may be read therefrom or transmitted to any suitable recording device for recording the result. Also during this resetting operation, the accumulator |20 may be returned to normal or zero indication by means fully set forth in any of the previously mentioned Patents 1,952,868, 2,096,429 and 2,099,892. As the Abrush 82 makes contact with its ninth contact 09 and thereby energizes the release relay 49, a new card feeding cycle is initiated due to the completion of a branch circuit through the clutch be broken and the card actuated contacts 30 will be opened. The circuit from ground at 6I through conducting member 24 and sensing pin I4 when it breaks,.wlll release relay 92 to transfer grounded battery at 69 from the make to the the result thereof will be accumulated in the accumulator |20. The multiplication of the other multiplier digits by the multiplicand will continue in a manner similar to that described in connection with the multiplicationof the digits punched in the first card and the multiplying commutator will go through its four revolutions,

whereupon the-result of the problem of multiplication having been accumulated by the acbreak contact of'relay 92, thereby releasing slow release relay 64 which falls back slowly whereby grounded battery at 63 will be connected through the break contact of relay 92 .before it is disconnected from the left hand make contact of relay 64. In this man'ner the multiplicand relays which had been locked up under control of the first card of the series will not be released at this time.

The breaking of the circuit from ground at 6I through the contacts 99, will have no effect since this circuit was also broken at the release relay 48.

As the card cycle proceeds in the same manner as described hereinbefore, the second card in the series having arrived at position under the sensing heads, the sensing head in moving kupwardly will carry the second card ofi-the series into engagement with the sensing pins, and since, as pointed out hereinbefore, there is no hole inthe second card in the .area thereof associated with the sensing pin I4, no circuit will be completed to the pin '|4. However, the card operated contacts 39 will be closed and' ground will be connected from 6| through the card operated contacts 99 and release relay 49 which at this time will have been deenergized to the brush 99 in engagement with itsY twenty-second contact 99, thereby initiating a multiplying "cycle involving the same multiplicand, but a new multiplier as sensed from the card. Accordingly, the multiplication must proceed to multiply the multiplicand stored in the multiplicand relays 99 by the digits 7,'5, y3 and 1, successively, beginning with the units order. Sensing pins II in the multiplier sensing head will iind apertures in the card in the following order: The sensing pins in the umts order'will find a hole in the second hole position from the left, -in the tens lorder the sens-'- ins pins' il wur-and a hule inthe tmrd holeposition from theJeft. the sensing pins II in the hundreds ordewill ilnd a hole in the fourth hole position from the left, and the sensing pins in the thousands order will und a hole in the fifth hole position from the left.

As described in connection with the previous problem, gro'und is connected through the brush 99 tothe bar 29 in the units order first, and therefore this ground connection in the umts order will be, continued throughs break contact of the relay 92 and through the windings of relays 9| (1) and 9| (9) and 94 in seriesto grounded battery at 99 thereby energizing relays 9| (1).

cumulator I 29, the'brush 82 will again make contact with its tenth contact 88, to stop the rotation of the multiplying commutator 43 and initiate the next card feeding cycle.

The fourth card feeding cycle which is actually the third effective cycle due to'the fact that it requires two cycles to get the first card under the sensing headswill bring the third card of the series under the sensing heads. bed 94 moves upwardly to engage the third card of the series, a hole will be found in the area of that card associated with the sensing pin I4 to energize the relay 92 as'described in connection with the first card of the series. The energization of relay 62 will break the circuit from grounded battery at $3 through the break contact of relay 92, thereby releasingl any multipllcand relays 68 which had been locked up. Further movement of the movable bed 34 as described hereinbefore will result in the locking up of mult licand relays 69 representative of the multiplicand factor which in this case 15.2468. 'I'he multiplicand sensing head will find holes in lthe third card of the series in the following order: In the umts order nies win be found by the first and second sensing pins from the left, in the tens I order holes will be found by the first and third,

sensing pins from the left, in the hundreds order holes w-ll be found by the first and fourth sensing pins from the left, and in the thousands order holes will be found by the first and fifth sensing pins from the left.

Since ground at 95 is connected over the make contact of slow release relay 64 to the sensing pins I1 in the multiplicand sensing head at this time, the sensing pins of the units order in finding holes in the first and second hole positions from the'left associated with the pins II, will continue this ground to the left hand break contact. of relay 99 (9) in the units order, and through the normally made portion of the make before break contact of relay 69 (1, and 9)' to energize these two relays and lock them in their t energized position. Similarly the multiplicand yrelays u (a) andes (sand I) 1n the tens order,

the multiplicand relays 69 (9) and 69 (9 and 4) in the hundreds order, and the multiplicand re- 9| (9) and 94. Energization of relay 94 will cause the energization of electromagnet 44 and start the multiplying commutator 49 in its cycle of rotation., 'I'he energization of relays 9| (1) and 9| (9) will break the ground connection to multiplicand lead 91 for the digit 9 and connect ground at 99 to the multiplier leads |99 for multiplier digit 7. The multiplicand digits are the same as in 'the previous problem, and the first rotation of the multiplying commutator 49 will,

as described hereinbefore, cause the multiplicand 3579 to be multiplied by multiplier digit 7 and order will be locked up.

With the multiplicand relays locked up as Just described, the rotation of the multiplying commutator will at predetermined intervals in each cycle of its rotation, connect the ground from the effective multiplier relay 9|, through the contacts on the disks II9 of the multiplyingcommutator. first, through the multiplicand lead I|4 for the digit 8 to make contact of relays 69 (1 and 9) andthe make contact of relay 99 (9) through the distributor switch to the accumulator and directly to the holding relays |22. In the tens order the ground connection through the multiplying commutator will be effective over multiplicand lead I I4 for the digit 6 to a make contact of multiplicand relay 99 (5 and i) and a make contact of multiplicand relay 99 (9) and through the distributor 9| to the accumulator As the movable l )having common multipllcands.

' connect ground atV stopped due to the operation of release relay 48` in the manner described hereinbefore, and the distributor will be returned to its normal position as shown, and succeeding cards may be sensed in automatic succession. Upon the completionof each computation the accumulator may also be returned 'to normal or zero position as described in the aforementioned Patents 1,952,868, 2,096,429 and 2,099,892.

After the last card has moved out from under the pin box 5, the movable bed 3 4, in' moving up, will carry no card with it and therefore contact 30 will not be closed, whereupon when the distributor returns to normal, as shown, the brush 80 will be disconnected from ground at 8| and the entire machine will come to rest.

'I'he operation of the machine has been described hereinbefore for use with a series of cards However, if it is desired to use the machine on a series of cards wherein each card has a separate multiplicand, the multiplicand switch 41 may be moved to its dotted line position so that the multiplicand elec- A tromagnets will be released after each card has been sensed. Movement of the common multiplicand switch 41 to its dotted line position will |40 to all of the sensing pins I1, thereby placing ground on the lbars 20 in every order whenever the movable bed 34 movesv upwardly. Furthermore, the ground at '1I will be disconnected from the armatures 'of the make before break contacts of the multiplicand relays, and this ground will be supplied to the armatures of the make before break contacts of the multiplicand relays 6# at predetermined intervals in the card, feeding cycle of the machine through a brush I4I associatedvyith contact disk 50.

If it is desired the above described trolling the indicating means, electrical circuits for controlling the' multiplying means, a plurality of sensing means for sensing record cards while stationary, and means associated with one of the sensing means for retaining one-of the factors and for effecting with the other sensing means joint control of the multiplying means through said electrical circuits. whereby one factor remains constant and the other factor varies in a series of successive multiplications.

2. In a record controlled multiplying machine, sensing means for simultaneously sensing all digits of the factors from successive record cards,

factor entry receiving means for one factor, a multiplying mechanism control-led jointly by said factor entry receiving means and a part of said Jsensing means, means for controlling said factor entry receiving means for retaining said one factor during a series of computations by said multiplying mechanism whereby a retained factor is multiplied by factors sensed from successive cards, and means for indicating the products computed by said multiplying mechanism.

3. In a record controlled multiplying machine, means for sensing av factor from la record while said record is stationary, means controlled by said sensing means for receiving the said factor, a second means for sensing asecond factor from a record while said record is stationary, multiplying mechanisms controlled by said receiving means and said second sensing means to effect -multiplication of the sensed and received factors,

. means for simultaneously sensing all of the digits machine with problems involving less than four digits in the multiplicand, thelrequired number of digit omitting keys 10 may be operated to render the sensing pin I1 associated Jtherewith ineffective. Similar keys may be provided in the leads running to the sensing pins lll in the multiplier sensing head to omit digits therein when' less than four digits are present in the multiplier factors of a series of problems, thereby making available for other use the unused columns of' the cards.

Throughout the specification and claims thel terms multiplicand and "multiplier have been used for convenience in discussing the two factors of a multiplication, but it is to be understood that these terms are interchangeable since either factor may be regarded as the multiplier or the multiplicand.

Although a specific embodiment of the invention is described hereinbefore, it will be understood that the invention is subject to many modifications without departing from the scope there- Y of which is limited only by the appended claims.

of multiplier and multiplicand factors from recordcards while said record cards are stationary,

a plurality of storage relays for storing the digits of one of the factors. a set of relays operable singly under control of a part of said sensing means in the course of multiplication to control multiplication by the other factor, a multiplying mechanism operable under the control of said storage relays and said set of relays for performing multiplication of the two factors, and means for sensing a predetermined .control area of each card of a series of record cards from which factor data is sensed to control the operation of the storage relays to determine whether a factor is to be retained for successive computations.

5. In a record controlled multiplying machine, -two separate sensing heads for sensing two factors from each of a succession of record cards while said cards are stationary, factor entry receiving means for one factor under control of one of said sensing heads, a multiplying mechanismy controlled jointly by said factor entry receiving means and the other of said sensing heads in accordance with a factor received by Vsaid receiving means' and a factor sensed from a card. means for controlling said factor entry receiving means for retaining said one factor during al series, of computations by said multiplying mechanism, and means for indicating the products `computed -by said multiplying mechanism.

HAROLD G. JOHNSTONE. JOHN C. GATES. 

